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Noise suppression circuit

a technology of noise suppression circuit and noise suppression, which is applied in the direction of electronic switching, pulse technique, instruments, etc., can solve the problems of deteriorating the total snr of the driver circuit, and achieve the effect of suppressing a noise in a voltage signal

Active Publication Date: 2017-10-05
SENSORTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a noise suppression circuit for suppressing a noise in a voltage signal. The circuit includes a switch unit, a capacitor, and an operational amplifier. The switch unit is controlled by a pulse signal, and the capacitor is connected to the first terminal of the switch unit and the second terminal of the switch unit. The analog front-end unit also includes a second reference-voltage generator. The noise suppression circuit can effectively suppress a noise in a voltage signal, which makes it easier to measure the signal accurately.

Problems solved by technology

However, noises often accompany the DC reference voltage during the generation of the DC reference voltage, so that those noises would be amplified by the AFE and thus deteriorate the total SNR of the driver circuit.

Method used

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Embodiment Construction

[0013]For your esteemed members of reviewing committee to further understand and recognize the fulfilled functions and structural characteristics of the invention, several exemplary embodiments cooperating with detailed description are presented as the follows.

[0014]In the following embodiments of the present disclosure, when an element is described to be disposed above / mounted on top of or below / under another element, it comprises either the element is directly or indirectly disposed above / below the other element, i.e. when indirectly, there can be some other element arranged between the two; and when directly, there is no other element disposed between the two. It is noted that the descriptions in the present disclosure relate to “above” or “below” are based upon the related diagrams provided, but are not limited thereby. Moreover, the terms “first”, “second”, and “third”, and so on, are simply used for clearly identifying different elements of the same nature, but those elements ...

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Abstract

This disclosure provides a noise suppression circuit for suppressing a noise in a voltage signal. The noise suppression circuit comprises: a switch unit having a first terminal receiving the voltage signal and a second terminal; a capacitor having a first terminal connected to the first terminal of the switch unit and a second terminal grounded; and an analog front-end unit including an operational amplifier with a signal input terminal and a reference-voltage input terminal electrically connected to the second terminal of the switch unit; wherein the switch unit is controlled by a pulse signal.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Taiwan application Serial No. 105109883, filed Mar. 29, 2016, the disclosure of which is incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a noise suppression circuit, and more particularly, to a noise suppression circuit for touch-panel driver circuits.BACKGROUND OF THE INVENTION[0003]In a touch-panel driver circuit, an analog front-end (AFE) uses operational amplifiers to amplify a weak response signal from a touch sensor and filters to filter a part of noise in the response signal; after that, the amplified and filtered response signal can be conducted to analog-to-digital converters (ADC) and digital signal processors (DSP) in the back-end unit of the touch panel, so as to generate a digitized touch-sensor signal with a better signal-to-noise ratio (SNR). Generally, the operational amplifier is provided with a DC reference voltage generat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/041G06F3/045G06F3/044H03K17/16G05F3/08
CPCG06F3/0418H03K17/16G06F3/045G06F3/044G05F3/08G06F3/04182
Inventor HU, YAO-SHENGWU, CHUN-KUANTUNG, CHING-JENTAI, HUNG-YEN
Owner SENSORTEK TECH